Viagra

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Sildenafil citrate is designated chemically as
1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine
citrate and has the following structural formula:

Sildenafil citrate is a white
to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a
molecular weight of 666.7.

What are the possible side effects of oral sildenafil (Revatio, Viagra)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of sildenafil.

Stop using sildenafil and call your doctor at once if you have a serious side effect such as:

What are the precautions when taking sildenafil citrate (Viagra)?

Before taking sildenafil, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.